46 Chapter 2
E4438C Vector Signal Generator Overview
Rear Panel Overview
24. 10 MHz OUT Connector
This female BNC connector provides a nominal signal level of +3.9 dBm ±2 dB, and an output impedance
of 50Ω. The accuracy is determined by the timebase used.
25. BASEBAND GEN REF IN Connector (Option 001/601 or 002/602)
The BASEBAND GEN REF IN connector accepts a 0 to +20 dBm sine wave or TTL square wave signal
from an external timebase reference. This digital modulation reference clock is used by the internal
baseband generator for both component and receiver test applications (only the internal baseband generator
can be locked to this external reference; the RF frequency remains locked to the 10 MHz reference). The
nominal input impedance is 50Ω at 13 MHz, AC-coupled.
This connector accepts a TTL or > −10 dBm sine wave external reference at rates from 250 kHz through
100 MHz. The internal clock for the arbitrary waveform generator is locked to this signal when external
reference is selected in the ARB setup. The minimum pulse width must be > 10 ns. The damage levels are
> +8 V and < −8 V.
This female BNC connector is provided only on signal generators with Options 001/601 and 002/602. On
signal generators with Option 1EM, this output is changed from a BNC to an SMB connector.
When using the real-time W-CDMA uplink personality, this connector is used to connect the external
baseband generator data clock.
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